Improvement in doors for furnaces



R. HILL. no'ons FOR FURNACES.

Patented Sept. 4,1877;

glllll'l/z'lllllllllllg H,FETERS, FHOTO-UYHOGRAFHER W SHINGTON, D .C.

UNITED STATES PATENT OFFICE.

RUFUS HILL, OF CAMDEN, NEW JERSEY.

IMPROVEMENT IN DOORS FOR FURNACES.

Specification forming part of Letters Patent N 0. 194,908, datedSeptember 4, 1877; application filed April 26, 1877.

. vide the fire-box of a steam-boiler with an internal door, which, whenopen, will serve to direct the air admitted through the doorway downwardonto the fuel, instead of permitting it to take a direct course to thetubes, and, by chilling the same, detract from the steamgeueratingcapacity of the boiler.

A further object of my invention is to retain the deflecting-door in anyposition to which it may be adjusted, so that the admission of airthrough the doorway may be under the entire control of the engineer.

In the accompanying drawings, Figure l is a vertical section of thefront of a locomotive fire-box with my improvements; Fig. 2, a sectionalplan on the line 1 2, showing the deflecting-door closed; Fig. 3, a planview of Fig. l; and Fig. 4, a view of the internal flange referredtohereinafter.

A represents the rear of a locomotive firebox, and a the doorway throughwhich the fuel is introduced, this doorway being, in the presentinstance, of circular form.

To studs b b projecting from the inner face of the fire-box is hingedthe deflecting-door D, which I prefer to make in the form of a hollowhemisphere, as shown.

At the upper portion of the door is a projection, d, which is connectedby a link or links, 0, to an arm, f, on a shaft, h, which has itshearings in studs *5 i secured to the front of the fire-box, and towhich is secured a lever, G, adapted to a notched segment, H, on thesaid fire-box, the lever being provided with a sliding bolt, m, theinner end of which is adapted to any one of the notches n in thesegment, this bolt being connected to a springhandle, 1), adjoining themain handle q.

By means of this lever, which is similar to the starting-lever of alocomotive-engine, the deflecting-door may be opened, closed, oradjusted to any desired position, and may be retained after adjustmentby the latch m and segment H.

By this combination of parts the engineer is enabled not only tomaintain the deflectingdoor in a proper elevated position for the admission of fuel to the fire-chamber, but to control the admission of airthrough the firedoor more efl'ectually than by the ordinary door, whileat the same time the connecting devices f e 01, being arranged close tothe top of the doorway, do not interfere with the proper manipulation ofthe shovel in feeding.

When the door is open, as shown in Fig. 1, it will deflect the volume ofair which passes through the doorway a of the fire-box downward onto thetop of the fuel, instead of permitting it to rush directly to and chillthe tubes-an evil which seriously detracts from the steam generatingeifect of the boiler, whereas the air deflected downward by the doorwill promote the combustion of the fuel.

On the edge of the doorway, in the inside of the fire-box, there is aflange, m, which is discontinued at y, as best observed in Fig. 4..

When it is desirable to admit a comparatively restricted volume of airinto the firebox, as is frequently the case, the door may be adjustedto, or about to, the position shown by dotted lines in Fig. 1, when theflange will aid the door in directing the air downward through theopening y presented by the gap in the flange as into the fire-box,instead of permitting it to take a direct course to the tubes.

I prefer to perforate the lower portion of the deflecting-door, asshown, so that when entirely closed small jets of air may be projecteddownward onto the fuel to promote combustion.

I claim as my invention- The combination of the doorway a and flange mwith the deflecting-door.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

Witnesses: RUFUS HILL.

HERMANN MOESSNER, HARRY SMITH.

